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  <title>PHP 5.3.x 保留的功能</title>

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  <h2 class="title">PHP 5.3.x 保留的功能</h2>
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   <span class="function"><a href="function.is-a.html" class="function">is_a()</a></span> 函数被保留. 它不再抛出 <strong><code>E_STRICT</code></strong> 错误.
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